Drill-feed.



PATBNTED JUNE- 25, 1907.

E. F. SMITH.

DRILL FEED.

APPLIUATIOI Hman 1m27.190s.

. clear, and exact dsecription of the invention,.

y. ELMEE E. SMITH, or CRIPPLE CREEK, COLORADO'.-`

DRILL-FEED.

Specification of LettersPatent.

. raten'eauune 25,1907.

y Application filed May 27, 1905. Serial No. 262.671.

To a/ZZ whom t may concern:

4Be it knownthat I, ELMER F. SMITH, a citizen of the United States, residing at Cripple Creek, in the county of Teller and State of Colorado, have invented `.certain new and useful Improvements in Drill-Feeds and I do hereby declare the followingto be a full,

such as will enable others skilled in the art to which it appertains to make and use the same. l

My invention relates to vimprovements in drill feeds, more especially designed for reciprocating rock drills, although it is not restricted to such use.

The object of my invention is to produce a sim le pneumatic drill feed, whereby the same ine of hose which supplies compressed air to operate the drill also automaticall feeds the drill forward. f

A further object of my invention is to rovide means for preventing this forward eed when desired.

With these objects in view, my invention consists in the construction and combinations of parts as hereinafter described and claimetll. d

n t e accompan g rawin st-Figure 1 is a side elevation dfufny improfed drill feed showing the same in position to operate a reciprocating rock drill, and Fig. 2 is a cross section on an enlarged scale of the same.

a represents the base piece, preferably rovided with a spur b which rests on a pla or other suitable support. Into the base piece a is screwed a tube c open at both ends. The upper part of this tube is surrounded by an enlarged gland din which is fitted a stuiiing box-e provided with packin a nut g being used to close the same. T e upper part of the stuffing box is rovided with a screw thread h. Within t e tube c is located a smaller tube 'i adapted to slide freely through the stuffing box e and guided by said stuffing box and a projection y' on the lower part of the tube which guides the tube t in the tube c. The lower end of the tube 'i is open and near its lower end it is provided with a series of perforations c to ermit the air to pass freel from the outer tu e into the inner tube in a l relative positions of the tubes.

represents a hose provided with a valve m 'which supplies compressed air or other plished simply by turning the tube i.

motor fluid to the tube c. Into the upper endof the tube i is screwed a solid plug provided with a small passage, and on this plug is mounted the casing o which carries the drill operating mechanism.

p: represents the drill which is mounted in the casing o. A short pipe g communicates with the passage n and sup lies air from said (paslage into the casing o, t us operating the r1 p. v

-r represents a valve of ordinary construction for opening or closingthe assage n.

The tube t' near its upper end) is provided with a collar s, and above the collar is located a revoluble annular collar t provided with a screw thread at its lower end which is adapted to engage with the screw thread h and prevent the -tube 't from being pushed forward by the action of the compressed air during the operation of the drill, this arrangement being useful, for example, when the drill is used to drillv a hole downward, the weight of the apparatus in such a case usually serving to feed the drill sufficiently. In case, however, it is desired to 'drill a hole upward as in Fig. 1, the collar t is disengaged from the screw thread h.

The operation is as follows: The valves m and 1' being opened, compressed air rushes in through the hose Zinto the tube c and thence into the tube t. The air then asses into the casing o where it operates t e\drill in the usual manner, and at the same time tends to lift the tube 'i which is loosely mounted in the tube c. The air from a single line of hose, therefore, not only operates the drill, but feeds it forward.

Another advantage of the construction shown, is that the drill p can be completely rotated in the same direction a number of times Without interfering with or stopping its action. This rotation may be accorpn many of the small pneumatic drills now in use, this is not possible.

Having thus described my invention, what I claim as new and desire to secure by L etters Patent of the United States is The combination of an outer tube closed at one end and provided with a stuiiing box at the other end, said stuffing box having a projecting screw threaded end, an air hose connected to said tube, an inner tube tele- IOO scopin freely in said outer tube and passing In testimony Whereof,I aHX my signature, throug siddstuing boi, said iner tube bein presence of two Witnesses. ing provi e with a oo ar, an an annular j collar surrounding said inner tube and pro- ELMER F SMITH' 5 vided with an internal screw thread adapted Witnesses:

to engage the screw on the proj eeting end of CURTIS J. SMITH, said stufling box, substantially as described. WM. H. BALE. 

